"Space bag" was an informal designation for a type of full-body protective garment used by Starfleet, first introduced in 2263. They were orange in color, and included a headpiece with a transparent pane. Though lighter and less cumbersome than standard environmental suits, they were generally disliked by most Starfleet personnel.

Engineers Montgomery Scott, J'lenn, and Kellerman wore these suits while attempting to affect repairs to Outpost 5 in 2264. (SCE eBook: Foundations, Book One)

The description of these "space bags" matches the suits worn by the Psi 2000 landing party in TOS episode: "The Naked Now".

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